Note 3 - Loans Receivable - Summary of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans receivable	$ 1,550,219	$ 1,510,178
Residential Portfolio Segment [Member] | One to Four Family [Member]
Loans receivable	493,011	469,567
Residential Portfolio Segment [Member] | Multifamily [Member]
Loans receivable	704,174	677,981
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans receivable	11,463	11,455
Construction and Land Portfolio Segment [Member]
Loans receivable	38,894	62,494
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	267,731	262,973
Consumer Portfolio Segment [Member]
Loans receivable	816	774
Commercial Portfolio Segment [Member]
Loans receivable	$ 34,130	$ 24,934